<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="css/style.css" />
    <title>Document</title>
  </head>
  <body>
    <div class=".bigbox">
      <form action="" class="login">
        <h1>login</h1>
        <img src="img/user.png" alt="">
        <input type="text" placeholder="用户名" required />
        <img src="img/lock.png" alt="">
        <input type="password" placeholder="密码" required />
        <input type="submit" class="btn" value="登录" />
      </form>
    </div>
  </body>
</html>
